| Killarney to Oerlinghausen | 770.87 mi (1,240.60 km) |
| Killarney to Oestrich-Winkel | 771.96 mi (1,242.35 km) |
| Killarney to Offenburg | 807.01 mi (1,298.75 km) |
| Killarney to Oftersheim | 810.69 mi (1,304.67 km) |
| Killarney to Ohrdruf | 872.91 mi (1,404.81 km) |
| Killarney to Ohringen | 853.46 mi (1,373.51 km) |
| Killarney to Olbernhau | 985.93 mi (1,586.69 km) |
| Killarney to Olching | 956.33 mi (1,539.07 km) |
| Killarney to Oldenburg | 745.49 mi (1,199.75 km) |
| Killarney to Oldenburg in Holstein | 855.27 mi (1,376.42 km) |
| Killarney to Olfen | 719.05 mi (1,157.20 km) |
| Killarney to Olpe | 746.90 mi (1,202.01 km) |
| Killarney to Olsberg | 769.90 mi (1,239.03 km) |
| Killarney to Oranienburg | 955.88 mi (1,538.34 km) |
| Killarney to Ortenberg | 809.81 mi (1,303.26 km) |
